SECTION 35 - HYDRAULIC SYSTEM
35-18
HYDRAULIC SYSTEM TESTING
Foot or hand controls and control valve spool
locks:
Pretest instructions:
* Hydraulic oil reservoir oil at proper oil level
* Operator in seat
* Service/Run switch in “RUN” position
* Seat belt fastened
* Ignition switch in the “OFF” position
STEP
TEST RESULT PROBABLE CAUSE AND CORRECTION
1
Foot and/or hand controls,
(boom and bucket)
Controls should not move
NO
YES
System OK
Check linkage to control valve spools, if OK go to
next step.
2
Check control valve spools for centering, if OK go
to next step.
3
Check for bent control valve spools, if OK go to
next step.
4
Check spool lockout solenoid operation, if not OK
refer to solenoid testing
Foot or hand controls and control valve spool
locks:
Pretest instructions:
* Hydraulic oil reservoir oil at proper oil level
* Operator in seat
* Service/Run switch in “RUN” position
* Seat belt fastened
* Ignition switch in the “ON” position
STEP
TEST RESULT PROBABLE CAUSE AND CORRECTION
1
Foot and/or hand controls,
(boom and bucket)
Controls should move
YES
NO
System OK
Check linkage to control valve spools, if OK go to
next step.
2
Check control valve spools for centering, if OK go
to next step.
3
Check for bent control valve spools, if OK go to
next step.
4
Check spool lockout solenoid operation, if not OK
refer to solenoid testing